Buck converter, control method, and use of the buck converter

• US 20060158160A1
• Filed: 01/17/2006
• Published: 07/20/2006
• Est. Priority Date: 01/18/2005
• Status: Active Grant

• Current Assignee: Puls GmbH
• Original Assignee: Puls GmbH
• Inventors: Friedrich, Heiner
• Granted Patent: US 7,495,425 B2
• Time in Patent Office: Days
• US Class Current: 323/222
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators

Abstract

A buck converter is equipped with a switch, a diode, an inductance, a capacitor, an input with a first connection and second connection, and an output with a first connection and second connection. The first connection of the input is connected to the first connection of the output via a series circuit comprised of the switch and the inductance; in particular, the switch is provided on the input side and the inductance is provided on the output side. In addition, the cathode of the diode is connected to the connection between the switch and the inductance while the anode of the diode is connected to the second connection of the input and to the second connection of the output. The capacitor is connected in parallel with the connections of the output. It is possible to trigger the switch by combining a first signal with a second signal and a third signal corresponding to a control variable from the output of the buck converter may be used to adjust the output signal.

Claims

1. A buck converter, comprising:

an input with a first connection (101) and second connection (102),

an output with a first connection (103) and second connection (104),

a switch (110),

a diode (D1) having a cathode and an anode

an inductance (L1),

a capacitor (C1),

wherein the first connection (101) of the input is connected to the first connection (103) of the output via a series circuit comprised of the switch (110) and the inductance (L1), the cathode of the diode (D1) is connected to the connection between the switch (110) and the inductance (L1), the anode of the diode (D1) is connected to the second connection (102) of the input and to the second connection (104) of the output, and the capacitor (C1) is connected in parallel with the connections (103, 104) of the output, such that the switch (110) may be triggered from a first state to a second state by combining a first signal with a second signal.

2. The buck converter as recited in claim 1, wherein the first connection (101) of the input is of a positive polarity and the second connection (102) of the input is of a negative polarity.

5. The buck converter as recited in claim 1 or 3, wherein the switch is triggered by combining the first signal with the second signal and a third signal.

6. The buck converter as recited in claim 5, wherein the third signal is a control variable from the output of the buck converter and is used to adjust the output signal of the buck converter and is substantially constant.

9. The buck converter as recited in claim 5 including means for regulating, wherein it is possible the third signal in conjunction with at least one of predetermined parameters selected among the output voltage of the buck converter, output current of the buck converter, and power of the buck converter.

11. The buck converter as recited in claim 5, wherein the switch (110) comprises at least one electronic switch.

12. The buck converter as recited in claim 5, wherein the diode (D1) is embodied in the form of an electronic switch.

13. The buck converter as recited in claim 11, wherein the electronic switch is selected from the group comprising transistor or at least one MOSFET, at least one thyristor, and at least one IGBT.

14. The buck converter as recited in claim 5, wherein the the switch is triggered by a signal representing the sum of the first signal and the second signal.

15. The buck converter as recited in claim 14, wherein the sum of the first signal and the second signal is compared to the third signal.

16. The buck converter as recited in claim 5, wherein the first signal is a current signal that corresponds to the current through the the electronic switch (110).

20. The buck converter as recited in claim 5, wherein the second signal is an essentially triangular shaped signal generated by a saw tooth generator.

22. The buck converter as recited in claim 20 further including means for adding the current signal and the essentially triangular shaped signal by integration of a voltage in the inductance (L1) and an additional voltage.

23. The buck converter as recited in claim 22, further including means for determining the additional voltage by peak value rectification of the voltage in the inductance using a retention time constant that is, in particular, greater than the line period.

25. The buck converter as recited in claim 23 further including means for an additional peak value rectification using a retention time constant that is less than the line period.

26. The buck converter as recited in claim 5 further including means for limiting on time duration of the switch (110) the voltage in the inductance falls below a predeterminable minimum voltage.

27. The buck converter as recited in claim 26, wherein on line duration of the switch 110 is limited when the voltage in the inductance falls below a predeterminable minimum voltage.

3. A buck converter, comprising:

an input with a first connection (101) and second connection (102);

an output with a first connection (103) and second connection (104);

a switch (110);

a diode (D1) having a cathode and an anode;

an inductance (L1);

a capacitor (C1);

wherein the first connection (101) of the input is connected to the first connection (103) of the output via a series circuit comprised of the switch (110) and the inductance (L1);

the anode of the diode (D1) is connected to the connection between the switch (110) and the inductance (L1), the cathode of the diode (D1) is connected to the second connection (102) of the input and to the second connection (104) of the output, and the capacitor (C1) is connected in parallel with the first and second connections (103, 104) of the output, and such that the switch (110) may be triggered from a first state to a second state by combining a first signal with a second signal.

4. The buck converter as recited in claim 3, wherein the first connection (101) of the input is of a negative polarity and the second connection 102 of the input is of a positive polarity.

7. (canceled)

8. (canceled)

10. (canceled)

17. (canceled)

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19. (canceled)

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24. (canceled)

28-35. -35. (canceled)